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  Oracle Tips by Burleson

Easy Oracle Automation
Chapter 5 -
Automatic Storage Management

Guru Conversation for the Senior DBA

Refer to Linux documentation on adding a new disk using fdisk, and adding entries in the /etc/fstab file as root. The server will have to be rebooted for the new disk to be visible in the operating system. Once the disk is added to Linux and used for ASM files with DBCA, the following errors may be encountered: ORA-15018, diskgroup cannot be created; ORA-15059, invalid device type for ASM disk. These errors have been reported only on Linux platforms, and can be rectified by creating files instead of real devices.

Assuming an 80 GB disk is added to a Linux server.  Also assume that when it was used one of the previously mentioned ORA errors was generated. The solution is to create new files to be used by ASM as free devices instead of real disks. The following steps could be attempted as an oracle user or as a root user. If using root, permissions may have to be changed on the files to be seen by ASM. Veteran DBAs with Linux experience may know how to run many of these individual commands in a single step.

Step 1 - Create new files using dd command. If the complete space out of the last disk is not achieved, reduce the count to 8000000.)

$dd if=/dev/zero of=file_dsk1 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk2 bs=1k count=1000000
$dd if=/dev/zero of=file_dsk3 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk4 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk5 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk6 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk7 bs=1k count=10000000
$dd if=/dev/zero of=file_dsk8 bs=1k count=10000000

The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

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